Nonlinear Parameters Form

The Nonlinear Parameters form requires somewhat different data depending on the type of analysis.

Material Nonlinearity Parameters area. The data in this area of the form is informational only. For nonlinear modal time-history (FNA) analysis, only link-object material nonlinearity is considered. For nonlinear static and nonlinear direct-integration time-history analysis, all link- and frame-object nonlinearity is considered.
Target-Force Iteration options.
Solution Control options. The solution control parameters are different for each type of analysis. See Solution Control for more information.

Click the Reset to Defaults button to restore the program default to the various options on the form.

Access the Nonlinear Parameters form as follows:

Click the Define menu > Load Cases command to display the Define Load Cases form.
Click the Add New Load Case button or highlight a previously defined load case and click the Add Copy of Load Case or the Modify/Show Load Case button to display the Load Case Data form.
Make one of the following selections:
- Select Static from the Load Case Type drop-down list and select the Nonlinear or Nonlinear Staged Construction option for Analysis Type.
- Select Time History from the Load Case Type drop-down list and the Nonlinear option for Analysis Type and the Direct Integration option for Time History Type.
Click the Nonlinear Parameters Modify/Show button on the Load Case Data - Nonlinear Static, Load Case Data - Nonlinear Static Staged Construction or Load Case - Nonlinear Direct Integration History form to display the Nonlinear Parameters form.